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Merge pull request #219 from bivasdas/templatr
Implemented templating featur
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93 changes: 93 additions & 0 deletions
93
jolt-core/src/main/java/com/bazaarvoice/jolt/Templatr.java
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| @@ -0,0 +1,93 @@ | ||
| /* | ||
| * Copyright 2013 Bazaarvoice, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| package com.bazaarvoice.jolt; | ||
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| import com.bazaarvoice.jolt.common.tree.MatchedElement; | ||
| import com.bazaarvoice.jolt.common.tree.WalkedPath; | ||
| import com.bazaarvoice.jolt.exception.SpecException; | ||
| import com.bazaarvoice.jolt.templatr.OpMode; | ||
| import com.bazaarvoice.jolt.templatr.spec.TemplatrCompositeSpec; | ||
| import com.bazaarvoice.jolt.templatr.TemplatrSpecBuilder; | ||
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| import java.util.HashMap; | ||
| import java.util.Map; | ||
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| /** | ||
| * Base Templatr transform that to behave differently based on provided opMode | ||
| */ | ||
| public abstract class Templatr implements SpecDriven, ContextualTransform { | ||
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| private final TemplatrCompositeSpec rootSpec; | ||
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| @SuppressWarnings( "unchecked" ) | ||
| private Templatr(Object spec, OpMode opMode) { | ||
| if ( spec == null ){ | ||
| throw new SpecException( opMode.name() + " expected a spec of Map type, got 'null'." ); | ||
| } | ||
| if ( ! ( spec instanceof Map ) ) { | ||
| throw new SpecException( opMode.name() + " expected a spec of Map type, got " + spec.getClass().getSimpleName() ); | ||
| } | ||
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| TemplatrSpecBuilder templatrSpecBuilder = new TemplatrSpecBuilder( opMode ); | ||
| rootSpec = new TemplatrCompositeSpec( ROOT_KEY, (Map<String, Object>) spec, opMode, templatrSpecBuilder ); | ||
| } | ||
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| @Override | ||
| public Object transform( final Object input, final Map<String, Object> context ) { | ||
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| Map<String, Object> contextWrapper = new HashMap<>( ); | ||
| contextWrapper.put( ROOT_KEY, context ); | ||
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| MatchedElement rootLpe = new MatchedElement( ROOT_KEY ); | ||
| WalkedPath walkedPath = new WalkedPath(); | ||
| walkedPath.add( input, rootLpe ); | ||
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| rootSpec.apply( ROOT_KEY, input, walkedPath, null, contextWrapper ); | ||
| return input; | ||
| } | ||
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| /** | ||
| * This variant of templatr creates the key/index is missing, | ||
| * and overwrites the value if present | ||
| */ | ||
| public static final class Overwritr extends Templatr { | ||
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| public Overwritr( Object spec ) { | ||
| super(spec, OpMode.OVERWRITR ); | ||
| } | ||
| } | ||
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| /** | ||
| * This variant of templatr only writes when the key/index is missing | ||
| */ | ||
| public static final class Definr extends Templatr { | ||
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| public Definr( final Object spec ) { | ||
| super( spec, OpMode.DEFINER ); | ||
| } | ||
| } | ||
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| /** | ||
| * This variant of templatr only writes when the key/index is present and the value is null | ||
| */ | ||
| public static class Defaultr extends Templatr { | ||
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| public Defaultr( final Object spec ) { | ||
| super( spec, OpMode.DEFAULTR ); | ||
| } | ||
| } | ||
| } |
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